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. 1982 Dec;16(6):1106-9.
doi: 10.1128/jcm.16.6.1106-1109.1982.

Improved method for testing susceptibility of Mycobacterium tuberculosis to pyrazinamide

W R Butler, J O Kilburn

Improved method for testing susceptibility of Mycobacterium tuberculosis to pyrazinamide

W R Butler et al. J Clin Microbiol. 1982 Dec.

Abstract

The acid medium required to test susceptibility of Mycobacterium tuberculosis to pyrazinamide (PZA) is a major problem in obtaining reliable test results. Satisfactory growth is usually obtained on Middlebrook and Cohn 7H10 medium at pH 5.5 if albumin-dextrose-catalase (ADC) supplement rather than oleic acid-albumin-dextrose-catalase is used; however, some lots of ADC supplement still fail to support growth at this low pH. A rapid turbidimetric test was developed to determine the growth-supporting potential of ADC enrichment for M. tuberculosis at pH 5.5. An atmosphere supplemented with 5 to 10% carbon dioxide, used to stimulate growth of tubercle bacilli on 7H10 medium, counteracted the growth-inhibiting effects of PZA. By using optimum conditions of medium and pH, the susceptibility of 90% of M. tuberculosis strains to PZA was determined.

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